%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Feng, C. Y.
%A Pedrero, Z.
%A Gentes, S.
%A Barre, J.
%A Renedo, M.
%A Tessier, E.
%A Beraitt, S.
%A Maury-Brachet, R.
%A Mesmer-Dudons, N.
%A Baudrimont, M.
%A Legeay, A.
%A Maurice, Laurence
%A Gonzalez, P.
%A Amouroux, D.
%T Specificpathways of dietary methylmercury and inorganic mercury determined by mercury speciation and isotopic composition in zebrafish (Danio rerio)
%D 2015
%L fdi:010065461
%G ENG
%J Environmental Science and Technology
%@ 0013-936X
%M ISI:000364355300044
%N 21
%P 12984-12993
%R 10.1021/acs.est.5b03587
%U https://www.documentation.ird.fr/hor/fdi:010065461
%> https://www.documentation.ird.fr/intranet/publi/2015/12/010065461.pdf
%V 49
%W Horizon (IRD)
%X An original approach is proposed to investigate inorganic (iHg) and methylinercury (MeHg) trophic transfer and fate in a model fish, Danio rerio, by combining natural isotopic fractionation and speciation. Animals were exposed to three different dietary conditions: (1) 50 ng Hg g(-1), 80% as MeHg; (2) diet enriched in MeHg 10 000 ng Hg g(-1), 95% as MeHg, and (3) diet enriched in iHg 10 000 ng Hg g(-1), 99% as iHg. Harvesting was carried out after 0, 7, 25, and 62 days. Time-dependent Hg species distribution and isotopic fractionation in fish organs (muscle, brain, liver) and feces, exhibited different patterns, as a consequence of their dissimilar metabolization. The rapid isotopic re-equilibration to the new MeHg-food source reflects its high bioaccumulation rate. Relevant aspects related to Hg excretion are also described. This study confirms Hg isotopic fractionation as a powerful tool to investigate biological processes, although its deconvolution and fully understanding is still a challenge.
%$ 036